ZyXEL Communications P-2612HW-F1 -, Руководство пользователя

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Chapter 6 WAN Setup
P-2612HW Series User’s Guide
105
6.3 The More Connections Screen
The ZyXEL Device allows you to configure more than one Internet access
connection. To configure additional Internet access connections click Network >
WAN > More Connections. The screen differs by the encapsulation you select.
When you use the WAN > Internet Access Setup screen to set up Internet
ATM QoS
ATM QoS Type
These fields are not available if you set the WAN mode to Ethernet
WAN.
Select CBR (Continuous Bit Rate) to specify fixed (always-on) bandwidth
for voice or data traffic. Select UBR (Unspecified Bit Rate) for
applications that are non-time sensitive, such as e-mail. Select VBR-RT
(real-time Variable Bit Rate) type for applications with bursty
connections that require closely controlled delay and delay variation.
Select VBR-nRT (non real-time Variable Bit Rate) type for connections
that do not require closely controlled delay and delay variation.
Peak Cell
Rate
Divide the DSL line rate (bps) by 424 (the size of an ATM cell) to find the
Peak Cell Rate (PCR). This is the maximum rate at which the sender can
send cells. Type the PCR here.
Sustain Cell
Rate
The Sustained Cell Rate (SCR) sets the average cell rate (long-term)
that can be transmitted. Type the SCR, which must be less than the PCR.
Note that system default is 0 cells/sec.
Maximum
Burst Size
Maximum Burst Size (MBS) refers to the maximum number of cells that
can be sent at the peak rate. Type the MBS, which is less than 65535.
MTU The Maximum Transmission Unit (MTU) defines the size of the largest
packet allowed on an interface or connection. Enter the MTU in this field.
For ENET ENCAP, the MTU value is 1500.
For PPPoE, the MTU value is 1492.
For PPPoA and RFC 1483, the MTU is 65535.
Back Click Back to return to the previous screen.
Apply Click Apply to save the changes.
Cancel Click Cancel to begin configuring this screen afresh.
Table 20 Network > WAN > Internet Access Setup: Advanced Setup (continued)
LABEL DESCRIPTION